High rejection evanescent MIC multiplexers for multifunctional systems

Abstract

An integrated circuit multiplexer comprises a waveguide having an interior cavity, first RF input port, and a first and second output ports; a dielectric structure positioned in the cavity; an RF input feed attached to the dielectric structure that extends through the RF input port; a first RF output feed attached to the dielectric structure that extends through the first RF output port; a second RF output feed attached to the dielectric structure that extends through the second RF output port; a first resonator pair mounted to the dielectric structure between the RF input feed and the first RF output feed, and electrically connected to the waveguide; and a second resonator pair mounted to the dielectric structure between the RF input feed and the second RF output feed, and electrically connected to the waveguide so that the first and second resonator pairs are generally coplanar. The waveguide is shaped as a right rectangular prism having a rectangular cross-sectional area characterized by a width L1 and a depth L2, where L1<(0.5)lambd, L2<(0.25)lambd, and lambd represents the center wavelength of a radio frequency signal that is input into said waveguide so that the waveguide operates in an evanescent mode in response to receiving the radio frequency signal.

We claim:  
     
       1. An integrated circuit multiplexer comprising: 
       a waveguide having an interior cavity, first RF input port, and a first and second output ports;  
       wherein said waveguide defines a right rectangular prism which has a rectangular cross-sectional area having a width L 1  and a depth L 2 , where L 1 <(0.5)λ, L 2 <(0.25)λ, and λ represents the center wavelength of a radio frequency signal that is input into said waveguide;  
       a dielectric structure positioned in said cavity;  
       an RF input feed attached to said dielectric structure that extends through said RF input port;  
       a first RF output feed attached to said dielectric structure that extends through said first RF output port;  
       a second RF output feed attached to said dielectric surface that extends through said second RF output port;  
       a first resonator pair mounted to said dielectric structure between said RF input feed and said first RF output feed, and electrically connected to said waveguide; and  
       a second resonator pair mounted to said dielectric structure between said RF input feed and said second RF output feed, and electrically connected to said waveguide such that said first and second resonator pairs are generally coplanar.  
     
     
       2. The integrated circuit multiplexer of  claim 1  wherein said waveguide operates in an evanescent mode in response to receiving said radio frequency signal. 
     
     
       3. An integrated circuit multiplexer comprising: 
       a waveguide having an interior cavity, first RF input port, and a first and second output ports;  
       wherein said waveguide defines a right rectangular prism which has a rectangular cross-sectional area having a width L 1  and a depth L 2 , where L 1 <(0.5)λ, L 2 <(0.25)λ, and λ represents the center wavelength of a radio frequency signal that is input into said waveguide;  
       a dielectric structure positioned in said cavity;  
       an RF input feed attached to said dielectric structure that extends through said RF input port;  
       a first RF output feed attached to said dielectric structure that extends through said first RF output port;  
       a second RF output feed attached to said dielectric structure that extends through said second RF output port;  
       multiple first resonator pairs mounted to said dielectric structure between said RF input feed and said first RF output feed, and electrically connected to said waveguide; and  
       multiple second resonator pairs mounted to said dielectric structure between said RF input feed and said second RF output feed, and electrically connected to said waveguide such that said first and second resonator pairs are generally coplanar.  
     
     
       4. The integrated circuit multiplexer of  claim 3  wherein said waveguide operates in an evanescent mode in response to receiving said radio frequency signal.